public async Task <bool> DeleteItem(KeySearch item)
        {
            try
            {
                await table.DeleteAsync(item);

                return(true);
            }
            catch
            {
                return(false);
            }
        }
        public async Task <bool> AddItem(KeySearch item)
        {
            try
            {
                await table.InsertAsync(item);

                return(true);
            }
            catch
            {
                return(false);
            }
        }